What this 400 A MCCB delivers
The Siemens SENTRON 3VA2340-6HL32-0HL0 is a 3-pole molded case circuit breaker rated for 400 A continuous current, designed for line protection in distribution panels. It carries a maximum breaking capacity of 4 000 A, with interrupting ratings of 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 7.5 kA at 690 V — so at common industrial voltages the SCCR headroom is substantial, letting you coordinate downstream without cascading upstream.
Thermal derating and real-world fit
Rated 400 A continuous up to 50 °C ambient; above that it derates linearly to 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, and 340 A at 70 °C. If your panel runs hot — say near a furnace line or in a non-climate-controlled enclosure — that 340 A at 70 °C is the number to size against, not the 400 A nameplate. The 110 mm depth, 138 mm width, and 248 mm height fit standard MCCB mounting footprints; verify gland-plate clearance for the 138 mm width before laying out the backpanel.
Built-in auxiliary and release options
Factory-fitted with 2 auxiliary switches, 1 trip alarm switch, and 1 electrical alarm switch (HQ configuration), plus a shunt trip release (STL). That means you get remote status indication and remote tripping out of the box — no separate add-on modules to order and install. The shunt trip lets a safety PLC or emergency-stop circuit drop the breaker without an operator at the handle. Power loss is 96 W maximum at rated current, so factor that into enclosure thermal calculations.